|Publication number||US6963360 B1|
|Application number||US 09/712,580|
|Publication date||Nov 8, 2005|
|Filing date||Nov 13, 2000|
|Priority date||Nov 13, 2000|
|Publication number||09712580, 712580, US 6963360 B1, US 6963360B1, US-B1-6963360, US6963360 B1, US6963360B1|
|Inventors||Daniel M Esquibel, Mark D Seaman, Paul M Hubel|
|Original Assignee||Hewlett-Packard Development Company, L.P.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (13), Referenced by (12), Classifications (15), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates generally to the field of imaging, and more particularly, to an adaptive and learning process for selecting settings in an imaging device.
Nearly all modern imaging devices have multiple settings which are controlled electronically. Purely mechanical controls in imaging devices have become extremely rare. Electronic settings controls in imaging devices provide much greater ease of use and improved image quality for the amateur user, since they can be preprogrammed for a number of different environments. For example, most modern cameras, whether film or digital cameras, have several modes with preprogrammed settings, such as for low light nighttime photography or for high speed sports photography. In each mode settings for exposure time, f-stop, etc are predetermined and programmed into the camera. These preprogrammed modes allow the user to take reasonably good pictures in a number of general types of environments.
In addition, many imaging devices allow the user to manually adjust one or more of the settings in order to deviate from the preprogrammed modes and settings. This allows the more experienced user to increase the quality of the images when none of the preprogrammed modes are well suited to the environment. In fact, with the unlimited variation in environment and the small number of preprogrammed modes in most imaging devices, it is unlikely that a preprogrammed mode will provide the best possible image quality. Furthermore, user's tastes in images vary widely, making it difficult or impossible to program settings which will most please every user.
As digital imaging devices have become increasingly popular, the problem is exacerbated, since digital cameras typically have more settings to adjust than film cameras. For example, digital imaging devices have a white balance setting, which is used to prevent color shifts, ensuring that white objects actually appear white. Thus, even though the number of preprogrammed modes may remain the same in digital cameras as in film cameras, the number of settings to be programmed for each mode is greater. This further decreases the likelihood that the preprogrammed settings will provide the preferred image for every user in a given environment.
Digital cameras are well known in the art and various components thereof are described in U.S. Pat. No. 4,131,919, U.S. Pat. No. 4,420,773, and U.S. Pat. No. 4,541,010, all of which are hereby incorporated by reference for all that they disclose.
Digital cameras require a high level of interaction with the user. There are a large number of settings that may be adjusted to optimize and personalize the resulting image quality. However, the process of adjusting the settings can be cumbersome and confusing to the user. The typical user may not understand many of the settings and how they affect the picture. In addition, the user usually needs settings optimized for only a few situations, and may be satisfied with the preprogrammed modes in other environments.
A need therefore exists for a method of adjusting settings in an imaging device which solves some or all of the above problems.
To assist in achieving the aforementioned needs, the inventors have devised an adaptive and learning setting selection method for imaging devices. This causes an imaging device to adapt to user preference over time. As the user adjusts settings in the imaging device, the new settings are combined with previous settings as points in settings space, forming a cluster of points. The camera then finds the optimal point in the cluster and uses the point to set camera options. Each mode in the camera thus develops a cluster of points in settings space, so that the optimal point changes as user preferences change. In addition, new modes may be formed in the camera when user settings differ to a large degree from settings in any predefined mode.
The invention may comprise a method of configuring settings in an imaging device. The method includes configuring the settings with default values. If at least one value for the settings is externally adjusted, the settings in the imaging device are configured with the at least one value. If the user indicates that the new settings are acceptable, the imaging device determines whether to store the new settings for use in calculating new default values.
The invention may also comprise an electronic imaging device having an imaging system and computer readable program code. The computer readable program code includes code for retrieving a default state of a plurality of settings in the imaging device, and code for configuring the imaging device with the default state of the plurality of settings. The computer readable program code also includes code for reading a new state of the plurality of settings after an image is captured, code for retrieving at least one previous state of the plurality of settings, and code for calculating a new default state for the plurality of settings from the new state and the at least one previous state of the plurality of settings.
The invention may also comprise a digital imaging apparatus having means for configuring the digital imaging apparatus with default settings, means for reading new settings on the digital imaging apparatus, means for determining whether to calculate new default settings, and means for calculating new default settings.
Illustrative and presently preferred embodiments of the invention are shown in the drawing, in which:
The drawing and description, in general, disclose a method of configuring settings in an imaging device. The method includes configuring the settings with default values. If at least one value for the settings is externally adjusted, the settings in the imaging device are configured with the at least one value. If the user indicates that the new settings are acceptable, the imaging device determines whether to store the new settings for use in calculating new default values.
The drawing and description also disclose an electronic imaging device having an imaging system and computer readable program code. The computer readable program code includes code for retrieving a default state of a plurality of settings in the imaging device, and code for configuring the imaging device with the default state of the plurality of settings. The computer readable program code also includes code for reading a new state of the plurality of settings after an image is captured, code for retrieving at least one previous state of the plurality of settings, and code for calculating a new default state for the plurality of settings from the new state and the at least one previous state of the plurality of settings.
The drawing and description also disclose a digital imaging apparatus having means for configuring the digital imaging apparatus with default settings, means for reading new settings on the digital imaging apparatus, means for determining whether to calculate new default settings, and means for calculating new default settings.
An adaptive and learning setting selection process may be included in any imaging device having at least one user adjustable setting, such as exposure time or aperture. The adaptive and learning setting selection process enables the imaging device to track or follow user preferences for these settings. Each time the user makes adjustments to the settings in the imaging device, the new values are accumulated so that the imaging device can learn and adapt to the user preferences. The imaging device then combines new user adjusted settings with accumulated previous settings to calculate optimal settings for the user. The imaging device is then configured according to the optimal settings.
For imaging devices having multiple modes, the accumulated values are stored according to the current mode. For example, an imaging device may have a sports mode and a normal mode, where the sports mode has a lower exposure time than the normal mode in order to capture high speed activities without motion blur. User adjusted settings are associated with a particular mode, so that each mode tracks user preferences for a certain environment.
The adaptive and learning setting selection process in an imaging device provides great benefits such as simplifying use and improving image quality for a given user. With the adaptive and learning setting selection process, the imaging device learns as the user adjusts settings. The imaging device thus becomes personalized, creating images which correspond much more closely to user preferences than those created with static, preprogrammed settings. The adaptive and learning setting selection process can also create new modes on the imaging device when the user adjusted settings differ greatly from settings in existing modes. For example, an imaging device may be preprogrammed with a sports mode for high speed imaging. If the user changes settings to create images of winter sports activities having a brilliant snowy background, the adaptive and learning setting selection process may create a new mode to capture high speed images that are not overexposed and washed out.
The adaptive and learning setting selection process also greatly simplifies adjustment of settings in the imaging device. The settings in the imaging device are defaulted to previous optimal settings based on user preferences. Therefore, the user will typically have fewer changes to make in a new environment than if the settings were preprogrammed to a factory default.
The adaptive and learning setting selection process may also simplify settings selection by presenting a group of sample images, each created with different possible settings. The user may then simply select the preferred image, rather than blindly adjusting settings manually. Typical users do not fully understand the settings and how they affect resulting images in a given imaging device without a great deal of practice. By presenting sample images, the adaptive and learning setting selection process allows the user to adjust settings much more easily.
Typical types of imaging devices which may benefit from the adaptive and learning setting selection process include digital cameras 10 (
Digital cameras 10 offer considerable advantages over conventional film-type cameras in that the digital image data may be stored, processed, and/or reproduced with ease. The relative ease of handling and processing the digital image data produced by digital cameras allows users to readily enlarge, reduce, crop, or otherwise modify the digital image data to create any of a wide range of photographic effects and styles, as well as to easily capture the image of a document and convert text in the image to a text file.
Before describing the adaptive and learning setting selection process in more detail, an exemplary digital camera 10 which may employ the adaptive and learning setting selection process will be described. However, it is important to note that the adaptive and learning setting selection process is not limited to any particular type of imaging device. For example, the imaging device may also comprise a scanner.
A digital camera 10 (
The housing 14 of the digital camera 10 comprises a generally rectangularly shaped structure sized to receive the various internal components of the camera 10. The housing 14 is sized to receive the optical imaging assembly, which includes a lens 20 and an electrical photodetector. The lens 20 is preferably telecentric or near telecentric. The photodetector detects image light focused thereon by the lens 20 and comprises a CCD, although other devices may be used. A typical CCD comprises an array of individual cells or “pixels,” each of which collects or builds-up an electrical charge in response to exposure to light. Since the quantity of the accumulated electrical charge in any given cell or pixel is related to the intensity and duration of the light exposure, a CCD may be used to detect light and dark spots on an image focused thereon.
The term “image light” as used herein refers to the light that is focused onto the surface of the detector array by the lens 20. The image light may be converted into digital signals in essentially three steps. First, each pixel in the CCD detector converts the light it receives into an electric charge. Second, the charges from the pixels are converted into analog voltages by an analog amplifier. Finally, the analog voltages are digitized by an analog-to-digital (A/D) converter. The digital data then may be processed and/or stored as desired.
The storage device in the digital camera 10 stores the image data collected by the optical imaging assembly. The storage device preferably comprises a random access memory (RAM), or may comprise a magnetic, optical, or other solid state storage medium.
The control system in the digital camera 10 provides a user interface, controls the optical imaging assembly, and processes and formats the image data, either before or after storage in the storage device. The control system also implements the adaptive and learning setting selection process. The control system preferably comprises a microprocessor and associated memory. Alternatively, the control system may comprise a hard-coded device such as an application specific integrated circuit (ASIC).
The display device 22 in the digital camera 10 is a liquid crystal display (LCD) or any other suitable display device. The digital camera 10 also includes other components, such as a battery system. However, since digital cameras are well-known in the art and could be easily provided by persons having ordinary skill in the art after having become familiar with the teachings of the present invention, the various systems and devices of a digital camera 10 that may be utilized in one preferred embodiment of the present invention will not be described in further detail herein.
During operation of the digital camera 10, the camera 10 is oriented with the lens 20 directed at a subject. The mode is selected and the settings are adjusted as desired by the user. The mode and settings are adjusted with the navigation buttons 24, 26, 30, and 32 or by any other suitable means, such as with a computer attached to the digital camera 10. The adaptive and learning setting selection process then calculates optimal settings and configures the digital camera 10 with the optimal settings, as will be described in greater detail hereinafter. (The optimal settings may be overridden by the user if desired.) The subject may be monitored either through a viewfinder (not shown) or on the display panel 22. When the digital camera 10 is properly oriented, the shutter control button 12 is pressed. The photodetector converts the image light directed thereon by the lens 20 into electrical image data, which are stored in the storage device. The control system then processes the image data and displays the captured image on the display panel 22.
Before continuing with the description of the adaptive and learning setting selection process, the relationship between modes and settings will be defined. The mode is a configurable state of the imaging device which is chosen according to the subject characteristics, such as brightness and speed of movement. Settings are used to control each adjustable parameters of the imaging device, such as aperture size and exposure time. For each mode, the settings are configured with values which produce an acceptable image given the subject characteristics. The hierarchy of modes (e.g., 40 and 42) and settings (e.g., 44–50, 52–56) in the digital camera 10 is illustrated in
Settings may be adjusted in several ways according to the adaptive and learning setting selection process. Settings may be entered by the user directly on the digital camera 10, e.g., by pressing the control buttons 24–32. Settings may also be entered on a computer which transmits the settings values to the digital camera 10.
Alternatively, settings may be adjusted by presenting sample images to the user, one of which is chosen as having the preferred image characteristics. In this case, a set of sample images is prepared, preferably all having the same subject matter. Each of the sample images is prepared to illustrate the effects of different settings values. For example, a set of three sample images may be prepared having three different exposure times. The user would then choose one of the three sample images, and the exposure setting on the digital camera 10 would be set to the exposure setting used to prepare the chosen sample image. The sample images may be displayed in any suitable manner, such as simultaneously or one after the other. The sample images may be displayed on the display panel 22, on a remote computer screen, or on a printed page.
Referring now to
Note that one or more settings may remain automatic in the digital camera 10, or all may be manually set. For example, the exposure time setting is often automatic in imaging devices, subject to an internal light meter. In this case, it may be desirable to exclude the automatic settings from the adaptive and learning setting selection process. In other words, automatic settings would not be included in the calculation for optimal settings. However, under some conditions, such as in a portrait studio, the lighting is controlled and the user may wish to manually control all settings in a digital camera 10, including exposure time. In this case, all settings would be included in the adaptive and learning setting selection process.
Note also that the digital camera 10 may be provided with an entirely manual mode, in which the adaptive and learning setting selection process is overridden and manually adjusted settings are directly used to configure the digital camera 10, rather than calculating and using optimal settings.
Three preferred embodiments of the adaptive and learning setting selection process will now be discussed. In the first, multiple previous states are accumulated in the digital camera 10 (see
The first preferred embodiment of the adaptive and learning setting selection process will now be described. In this embodiment, the digital camera 10 accumulates previous settings as points in a settings space. The settings space is a multidimensional space in which each dimension in the settings space is defined by one of the settings in the digital camera 10. Points in settings space are preferably grouped in clusters according to different modes on the digital camera 10.
An exemplary settings space 100 is illustrated in
The settings space 100 is bounded on four sides 106, 108, 110, and 112. The position of the boundary is determined by the acceptable range of settings in the digital camera 10. The top boundary 106 and bottom boundary 112 are established by the upper and lower limits, respectively, of the first setting. The left boundary 108 and right boundary 110 are established by the upper and lower limits, respectively, of the second setting.
In this example, the digital camera 10 has two modes, each having a cluster 114 and 120 of points (e.g., 124 and 140). The first cluster 114 of points is associated with the first mode, and the second cluster 120 of points is associated with the second mode. That is, the points in the first cluster 114 were stored while the digital camera 10 was in the first mode, with only small manual adjustments were made to the settings. The points in the second cluster 120 were stored while the digital camera 10 was in the second mode, with only small manual adjustments made to the settings. The digital camera 10 is preferably preprogrammed with a settings point for each mode by the manufacturer. This allows the digital camera 10 to be configured with suitable initial settings in each mode, before the adaptive and learning setting selection process personalizes the digital camera 10 according to user preferences.
The optimal point of a cluster is used to find the best representation of a users preferences. As the user manually adjusts settings, adding settings points to a cluster, the cluster will become increasingly dense with points and the optimal point in the cluster will become an increasingly good representation of the users preferences. The optimal point of a cluster is preferably the arithmetic mean of the cluster, as this calculation can be done rapidly by a simple processor. Alternatively, other algorithms for calculating an optimal point to represent a cluster may be used. For example, the median may be used, which is less sensitive to outlying settings points in a cluster than the mean, although it is not as simple to calculate.
The process for finding the optimal point of a cluster as the arithmetic mean is illustrated in the flow chart of
For example, referring to
Similarly, the second cluster 120 consists of six settings points, point 140 at (3,8), point 142 at (4,5), point 144 at (5,4), point 146 at (4,3), point 150 at (2,2), and point 152 at (6,2). The first coordinates of each settings point in the cluster are summed, then divided by the number of points in the cluster: (3+4+5+4+2+6)/6=4. The second coordinates of each settings point in the cluster are then summed and divided by the number of points in the cluster: (8+5+4+3+2+2)/6=4. The resulting coordinates are then grouped as the location of the optimal point 122: (4,4).
The settings space is not limited to the two dimensional example described herein. In practice, a multidimensional settings space includes one dimension for each setting on the digital camera 10 which is to be included in the adaptive and learning setting selection process.
Points (e.g., 124 and 140) in settings space 100 may be clustered, or arranged into clusters, in any suitable fashion. A number of suitable mathematically intensive but effective clustering algorithms are well known. The preferred method, and perhaps the simplest, is to preprogram an initial point in each cluster as mentioned above. Thereafter, a new point is included in a cluster if it is within a predetermined threshold distance 156 of the optimal point in a cluster. For example, the point 126 is within the threshold distance 156 from the optimal point 116 of the first cluster 114, but outside the threshold distance 156 from the optimal point 122 of the second cluster 120. Therefore, the point 126 will be stored with the first cluster 114.
The point 154 is outside the threshold distance of both clusters 114 and 120, so a new cluster and mode will be created containing the point 154. Note that this means that if the digital camera 10 is placed into a certain mode and the settings are drastically manually adjusted, the mode may be changed or a new mode can be created based on the new settings.
If a new settings point is within the threshold distance of the optimal point of more than one cluster, it is included in the closest cluster.
Note also that the boundary of a cluster (e.g., 114), defined by the threshold distance 156 from the optimal point (e.g., 116), may fall in part outside of the settings space 100 if the optimal point 116 is close enough to one or more boundaries (e.g., 106) of the settings space. For example, a portion of the boundary of the first cluster 114 includes a region 118 outside the settings space 100. However, since no settings points outside the settings space 100 can be entered on the digital camera 10, no points will fall in regions 118 inside clusters but outside the settings space.
Referring now to
The cluster with the nearest mean point to the new settings point is selected 174, and the distance to this nearest mean point is compared 176 with the predetermined threshold distance. If the new settings point is within the threshold distance, the new settings point is stored 180 with the cluster, and the new arithmetic mean of the cluster is calculated and stored 182. If the distance between the new settings point and the nearest mean point is greater than the threshold distance, a new cluster is created 184 containing the new settings point, and the arithmetic mean of the new cluster is stored 186. (In this case, with only one point, the arithmetic mean is at the same location as the new settings point.)
Calculating and storing the arithmetic mean for a cluster when adding a new settings point speeds up later operations by avoiding the need to recalculate the mean over and over when changing modes on the digital camera 10 or when adding later settings points.
The number of previous settings states, or points, which are accumulated in the preferred embodiment may be limited by the available memory in the digital camera 10 or may be limited to a predetermined number to simplify clustering calculations.
The adaptive and learning setting selection process for the preferred embodiment in which multiple settings points are accumulated in clusters will now be summarized (see
The second preferred embodiment of the adaptive and learning setting selection process will now be discussed (see
In this embodiment, manually adjusted settings are also not automatically stored. The digital camera 10 has three accumulation modes which determine whether new manual settings are stored or accumulated. In the first, new manually adjusted settings are automatically stored. In the second, new manually adjusted settings are automatically discarded. In the third, the digital camera 10 prompts the user to indicate whether to store or discard the new manually adjusted settings.
This process is illustrated in
The accumulation mode is checked 230 to determine whether to store the new manually adjusted settings. If the digital camera 10 is in Discard mode, the manually adjusted settings are discarded 232. In other words, the manually adjusted settings are not stored, even though the digital camera 10 remains configured with them until the mode is changed, the digital camera 10 is turned off, or new manually adjusted settings are entered. If the digital camera 10 is in Add mode, the new manually adjusted settings are stored 234 with previous settings. If the digital camera 10 is in Prompt mode, the user is prompted 236 to indicate whether to store or discard the new settings. If the user indicates 238 that settings should be stored, the new manually adjusted settings are stored 234 with previous settings. If not, the new manually adjusted settings are discarded 232.
The third preferred embodiment of the adaptive and learning setting selection process, in which only the most recent previous state is kept, will now be discussed (see
This process is illustrated in the flow chart of
Aspects of an adaptive and learning setting selection process are also described in U.S. patent application entitled “ADAPTIVE AND LEARNING SETTING SELECTION PROCESS FOR IMAGING DEVICE” U.S. Pat. No. 6,914,624 of Daniel M. Esquibel, et al., filed concurrently herewith and which is incorporated herein by reference for all that it discloses.
While illustrative and presently preferred embodiments of the invention have been described in detail herein, it is to be understood that the inventive concepts may be otherwise variously embodied and employed, and that the appended claims are intended to be construed to include such variations, except as limited by the prior art.
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|U.S. Classification||348/207.99, 348/222.1, 348/E05.042, 348/362, 348/655, 396/439, 348/211.6|
|International Classification||H04N101/00, H04N5/232, G03B7/091, G03B7/00|
|Cooperative Classification||H04N5/232, H04N5/23245|
|European Classification||H04N5/232R, H04N5/232|
|Mar 14, 2001||AS||Assignment|
Owner name: HEWLETT-PACKARD COMPANY, INTELLECTUAL PROPERTY ADM
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ESQUIBEL, DANIEL M.;SEAMAN, MARK D.;HUBEL, PAUL M.;REEL/FRAME:011643/0126;SIGNING DATES FROM 20010119 TO 20010201
|Sep 30, 2003||AS||Assignment|
Owner name: HEWLETT-PACKARD DEVELOPMENT COMPANY L.P., TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HEWLETT-PACKARD COMPANY;REEL/FRAME:014061/0492
Effective date: 20030926
Owner name: HEWLETT-PACKARD DEVELOPMENT COMPANY L.P.,TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HEWLETT-PACKARD COMPANY;REEL/FRAME:014061/0492
Effective date: 20030926
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